Light Center Length (L.C.L.) is the distance from the center of the light source to the following point for the base used: Screw base...bottom base contact; Bayonet candelabra and medium bayonet...top of base pin; S. C. or D.C.Preforcus - Plane of locating bosses of prefocusing collar.

BASE IDENTIFICATION

Typical bases are shown. One lead-in wire is soldered to the center contact and the other soldered or welded to the upper rim of the base shell. Base shells are
typically made of brass or aluminum. ANSI designation are in parentheses.

Candelabra
cand. (E12)

Intermediate
Inter. (E17)

Medium (E26) &
Medium Bass
(E26)

3 Contact
Medium
3 C Med (E26D)

MediumSkirted
Med. Skirt
(E26/50x39))

Mogul Screw

3 Contact Mogul

Double Contact
Bayonet D.C.
Bay (BA15D)

S14s

Mogul End Prong

Med Slide Pr.

Screw Terminal G53

FILAMENT IDENTIFICATION

A FILMENT designation consists of a prefix letter to indicate whether the wire is straight or coiled and a number to indicate the arrangement of the filament on the
supports. Prefix letters include: C (coiled) -- wire is woound into a helical coil or it may be deeply fluted; CC (coiled coil)--wire is wound into a helical coil and this coiled wire again wound
into a helical coil.